feat: add sub2api compatibility

handler/ai_test.go

@@ -1,8 +1,13 @@
 package handler
 
 import (
+	"bytes"
+	"encoding/json"
+	"mime/multipart"
 	"strings"
 	"testing"
+
+	"github.com/basketikun/infinite-canvas/model"
 )
 
 func TestAIUpstreamErrorDetail(t *testing.T) {
@@ -25,3 +30,51 @@ func TestSafeUpstreamTextTruncates(t *testing.T) {
 		t.Fatalf("truncated rune length = %d", len([]rune(got)))
 	}
 }
+
+func TestAdaptAIRequestForSub2APIImagesUsesURLResponseFormat(t *testing.T) {
+	body, contentType, err := adaptAIRequestForChannel([]byte(`{"model":"gpt-image-1","prompt":"cat"}`), "application/json", "/images/generations", model.ModelChannel{Compatibility: "sub2api"})
+	if err != nil {
+		t.Fatalf("adaptAIRequestForChannel returned error: %v", err)
+	}
+	if contentType != "application/json" {
+		t.Fatalf("contentType = %q", contentType)
+	}
+	var payload map[string]any
+	if err := json.Unmarshal(body, &payload); err != nil {
+		t.Fatalf("invalid json body: %v", err)
+	}
+	if got := payload["response_format"]; got != "url" {
+		t.Fatalf("response_format = %#v, want url", got)
+	}
+}
+
+func TestAdaptAIRequestForSub2APIImageEditsUpdatesMultipartResponseFormat(t *testing.T) {
+	var input bytes.Buffer
+	writer := multipart.NewWriter(&input)
+	_ = writer.WriteField("model", "gpt-image-1")
+	_ = writer.WriteField("response_format", "b64_json")
+	part, err := writer.CreateFormFile("image", "input.png")
+	if err != nil {
+		t.Fatalf("CreateFormFile: %v", err)
+	}
+	_, _ = part.Write([]byte("png"))
+	if err := writer.Close(); err != nil {
+		t.Fatalf("Close multipart writer: %v", err)
+	}
+
+	body, contentType, err := adaptAIRequestForChannel(input.Bytes(), writer.FormDataContentType(), "/images/edits", model.ModelChannel{Compatibility: "sub2api"})
+	if err != nil {
+		t.Fatalf("adaptAIRequestForChannel returned error: %v", err)
+	}
+	reader := multipart.NewReader(bytes.NewReader(body), strings.TrimPrefix(contentType, "multipart/form-data; boundary="))
+	form, err := reader.ReadForm(1024)
+	if err != nil {
+		t.Fatalf("ReadForm: %v", err)
+	}
+	if got := form.Value["response_format"]; len(got) != 1 || got[0] != "url" {
+		t.Fatalf("response_format = %#v, want [url]", got)
+	}
+	if files := form.File["image"]; len(files) != 1 || files[0].Filename != "input.png" {
+		t.Fatalf("image file = %#v", files)
+	}
+}